Amy Jo stated it right all AED's are designed to stop seizures. An AED which works for one perason and dossage the same does not work on the next which is why there is no one size fits all AED. If the medication reduced the seizures it was doing what it was designed to do. If he is having problems with other medications there are many created to work in other areas of the body to disolve in different ways. I saw that you have tried diferent things, meds, diets and are still trying. It took a long time to actually get a diagnosis for me. Testing did that and I still had seizures from time .
I do hope you can get him back to a specialist and he gets tested and they do get his seizures under control.